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W. A. COATES, G. E. GITTINS AND D. R. DAVIESJ ELECTRICAL SWITCH GEAR.

APPLICATION FILED MN. 20. 1921.

Patented Jan. 3, 1922.

3 suns-shin 1.

WITNESSES:

NEY

AT'TOR W. A. COATES, G. E. GITTINS AND D. R. DAVIES.

ELECTRICAL SWHCH GEAR.

APPUCATION FILED HQ. 20. 92!.

1,402,570. Patented Jan. 3, 1922.

3 SHEETSSHEET 2.

INVENTORS WTNESSES: Wll/idm lnsebr C' a/es.

a cur-ya yara fl 21s. and m a 40 1/ wwpawu,

W. A. COATES, G. E. GITHNS AND D. R. DAVIES ELECIRICAL SWITCH GEAR.

APPLICATION FILED IAN-20.192!- 1,402',570, Patented Jan. 3,1922.

3 SHEET S-SHEET 3.

q/d Eeyma/d Dar/e: W

ATTORNEY e To allwlwmit UNITED STATES PATENT OFFICE.

coarse or, qnosLron-oom-Hanmr, elm ononesnnwano GII'IIINS: ND DAVID REQINALP assronpn's,

Dems, om p X MES ass ewmr 'roiwnsrmenofi'n Mmracronmo comm. Aiconr'omrion "ELECTRIC V I comm:

' Be known t e. Wm Con-res, a subject of. the-King 015 Great B mmd a, resident oi Chorlton-onm- Hardy, in the county of=Lenqaster,-En l nd,

onon Enwann .Gxrrms, a subject ofthe 3 8 9f Great fs gvand & eside t-1 f Stnatford,- lilanches ter in, the county-of Lancaster, lpgl etgen D W=RWN Dnvms, a sulneotof the of Great. Brit? sin, and ares denthqt Stretford; Manchester, in the,. countg' of Lancaster England; have invented anew and, useful lm rovement in and Relating toEIectricaL; s ivitch Gears, of which the following is a specification. 1

This invention relates to electrical switch gear-of what is commonly known asltheironclad type and has ior its object to construct imgroved apparetus'of this kind.

wording to the inventionthereisprovided betweenthe oil switch and thesealing box or casing containing the end of the cableto which the switch is to beconnected, one or more metalcasings which contain the usual isolating switches and-selector switches and the scenes transformers or such of hese devices-1 as are necessary .or prorided. The terminal rods or conneotlons fromthese ariousdeyices pass out from said casing through suitable insulating bushes and at these points, the appropriate boxes or casingsare attached in. which connection is medeto the cable or to the bus-bars, ,as the case may he,and also with the terminals of the oil switch. After all the ermenent connections have been made casingv or casings containing the isolating and selector switches and. series transformers are completelyfilled with oil and the terminalboxes attached thereto are filled ith a suitable insalatim material or compound. The tank of .the oil switch isfilled with thensualoih To enable the invention to be clearly understood it will now be described with reference to the accom' anying drawing which illustrates by way 0 example a ooustrnction of switch gear. in accordance with the invent tion as applied to a three-phase electrical tem with split conductor protection. i i g. 1 is a. sectional elevation of the switch gear showing the essential elements of. one phase of the system. Fig. 2 1s a. front elevation of the switch gear partly in section,

Specification of Lctters'Pateut.

Animation filed hum 1931. Serial No.

Patented Jan. sneer. 38,814.

the left-hand central ortion bein a section on the line 11-41 of 1, whilst the r hthand central portion is a section on thefiine LII-III of F 1%. 1,Fig. 318a. plan and Fig. 4 an end view 0 a detail'on a larger scale. Fig. 5 is .an electrlcal diagram of thefcircuits through one hase of the switch ear. Fi 6 and Tare e ovations of intorloc in mocha msm for the switch gear showing t e parts of the mechanism in difiefentipflmtlflhs, and Fifies zs' a plan of the same.

A 'ferrmg to the drawing 1 represents the cable, whlch may be the incoming 'cable of the feeder for exampl" 2 represents one phase conductorof the ca 1e, and 3 the oil switch corresponding; thereto which may be of eny suitable-Inn 4 represents a motel casing Iocated -between thecable 1 'and the 011 switch 3 containing the isolating and selectorswitches indicated as a whole at 5, the transformer 6 for split conductor pro+ tectzon and theinstmment or series transformer 7 or such devices as are or may be Provided. The main bus-bers are indicated )y-thenumerals 8', 9-, 10 and duplicate-or hospital bars by 11, 12, 13. Theleads or conductors'irom the isolating and selector switch contaotswo the,cable and husxbars pass out of the casingw through the insulatmg bushings 14 andsthe leads:01- conductors from the switch terminals and transformer devices in the casing 4 to the terminals of theoil switch 3 pass out through insulating bushings or tubes as indicated at 15. The connections between-the leads or conductors in the bushings 14 and the conductors-2 and bus-bars are. contained in the terminal box as indicated at 16, comprising a fremelike portion 17 attached to the main 4. and a front or cover portion 18 adapts to be at tached to the rear portion 17. The said box also constitutes a trifurcating box for the cable 1 (see Fig. 2). The leads on conductors passing through the tubes or bushings 15 have connections 19 withsimil'ar insulated terminal rods in the bushings 20 connected with the terminals of the oilswitoh, the said terminal rods :and connections being a.rranged in aterminal box 21 .const1tut1ng part of the head of the oil switch and rovided with a cover 22. The venous 0a and boxes 4, l6 and 21 are constructed so as to fit together and are connected by means '30 'materinl such for "example-us 'the 'substence of bolts end nuts or in any other conyement manner.

ing-4 and mey be' either ordinary single core main and auxiliary or hospital hos-burs er, conveniently arrenged in sectorvshaped c''s'ings"24'"25 shown in ig. 1, the'-- said: :cesxngs mountedon supporti frames 26 carri 'The; connections between the ends from the'selector switches and the bus-chars ere'constituted by conducs'trips 2S enclosed in thebox 16 and" the latter is provided integrally," as shown, with acdistributing chamber 29 which is arranged beneath-the casing A and centrnll between the-two-ca'sings 24: h'nd'25. The c amber 29 rests up'on-etlie pedestel- 27 and serves to supthe foasingzdg in the center; A frame 'rder 30 rests on tlre-upper end of-the busnrccasing 25. and supports -the-.r' ht-hand or oilswitch end of the ca'siu'g4. f he-lower artzzofvthe ,box 16 is supported von the busar 24. .The connections'between the lehds 28dandthe bus-bars comprise copper in-tubesi31oi an insulating commonly known as bukelite. Holes are made in.the chamber'29'gandin the casin 2%; through which theconducting ro s and tubes-B1 pass radially as shown. After the connections in the chambers or boxes 16 end 21.. have been; made, simulating compound -is. r'un' in, completely filling these chambers. r51

wTh'ei-ditgram, shows the circuits ofone=phese of the system. :The casingsan'd boxes 4,118 end 21 are-indicated in dotted lines 'in-this Figure: Theplmse condueton 2, by way of example,- is of the split core typeythe two splits or. conductors 32 and 33 of which seperotein the box 16 and are connected to the terminals of the isolating switches 34 and '35. I From the other terminals of the switch; the conductors 32 and 38ipass through the split conductor proteiit'ion transformer 6' and the series or instrument transformer 7 terminating in separetecontact blocks in the oil switch, the

'bridge of which connects them together. The other terminal of the latter is connected by a. lead 36, 37 to the terminals of the two selector switches38 and' 39. The letter ereheda 'ted tocon'nect' the lead 37 with itherit e main bus-bersB or the auxiliary or hospital bus-bar '13 through the leeds28.

40 represents a potentieltrensformer which is conveniently located in a casing 41 mounted'u on a frame 42 su'pfiorted on the'box or hen :21 ofthe oil switc 3 (see Figs. 1 and 2). The connections between the potential transformer nndthe phase conductors 37 .w msuletingtub The bus-barshrefloceted beneath the 02s:

symm" 'etrically situated as" hem preferably comprise copper conductors in es es representednt 43 (Fig. 1). The potential transformeris filled with 011 in which the -otent'inl transformer fuses are also preferabl; immersed. I

The operating rods 44 of the isolotin and selector switches Pass vertically upwarc s between the insulating contact supports 45 of the said switches and supporting bridge 'plate 46 and are connectd in any convenient manner to the switch operatin mechanism indicated as a whole at 47, see 1., The operating mechanisms for all the isolating and selector switches are similar, and are arranged side by side in the same axial line. All the switches which are to be opened or closed (that is to say, sinisolctingnnd three selector switches in a three-phase system) with duplicate bus-bars end split'condnctor protection are'erran'ged to be operated-simultaneously' by a. smglelever 4E8 or"b' "'n hand-wheel or other mechnhisme "l In order that the "desiredseletbr switches may be operated to connect either the main or the hospital busehars to the oil switches, the operating rods 14 are pr'oi'rid'e'd with henclsoi' enlargements 49 designed to pass throu h erforations 50 in an o erai'ting bar 50 w "c is common to all he isolating and selector switches for each pha'se. Either of the heads 49 of the switchesfi s',

39 canbe operatively connected with"th' bar 50 by means of a sliding keyplate 51which is channelled as shown and designed to'he moved along the bar 50 to enga e ben'eth either of t e said heads or e argements 49, slots '52 being provided in the ends of the late as clearly shown in- Figs. 3. and 45* n'y other'meens, however-{may berovided selecting the desired" switch. he operating rods of the isolati'ri switches 34 and 35 are permanently connec ed to the bar 50. The mechanisms 47 for each phase are provided with covers 53 which together with plates '54 cover in the casings 4.

The operet' mechanism for the oil switch'3(Fi is indicated as a whole by the numeral 5. 1

The operating mechanisms of the isolating" and'selector switches are preferably interlocked withthe' mechanisms for'operotin the oil switches insuchn manner that (1)1: e isolating 'and selectorswitches cannot be opened unlem the oil switch is open (2) it will be 'ble to close the oil switch if ell'the isolating and selector switches are open; (3) when the oil switch is closed it will not be possible to close the isolat' and selector switches; and (4) it will not be goxihle to remove the oil' switch tank or t e lid of th potentialtransformertank or the covers 53 of the casing 4 containing .headofi the oil. switch 3. The rod 56; is

provided with a plate 60 having a key hole slot therein with a narrow rtion 61 and two large portions 62. A. re 63 is attached to the solenoid, glungerof: the oil switch 3 and moves wit the same when the oil switch is operated, the said rod 63 being provided with an enlar ment 64 which may pass through either 0 the lar er portions 66, the arran 62 of the key hole slot in te plate 60 but not through the narrower portion 61, the latter, however, allows the rod 6Kto pass.

Fig. 6 shows the position of the mechamsm when the isolating: and selector switches 5 are closed,-the oil switch being b also closed. It. will be seen that in this osition the enlargement 64 is inthemightliand end 62 of the slot so that it will be 1mpos'sible to open the switches 5 as the rod 56 cannot move to. the right. The opening of the 'oil switch. raises. the. enlar ement 64 above the plate 60 out of the s at 62 and permits the rod 56 tomove to the right.

Figs. 7 and 8 show the mechanism in the open position of the switch, the lever 56* having been moved to the right and the enlargement 64 be in the le hand portion 62 of the slot in e plate 60. It will thus be possible to close the oil switch if all the isolating and selector switches are opened and it will be impossible to close the switches 5 when the oil switch 3 is closed.

The rod 56 is also rovided with a plate 65 having a keyhole 0t 66 therein wi an enlar ed portion 67. A red 68 connected bv afiink 69 to a lever portion 70 of the hinged lid 71 of the otentia-l transformer casing 41, is arran e to pass through the slot 66 and is ui ed at 72 in the head of the oil switch. The rod es is provided with an enlargement 73 for engaging in the slot ent bein such that it will not be possibe to open the lid. of the potential transformer tank 41 unless both the oil switch and all the isolating and selector switches are 0 ened. Interlocking mecha-.

nism between e oil switch tank, the cover of the transformer casing and the oil switch, isolating and selector switches can be so readily arranged on well known principles that it is not deemed necessary to describe an specific form.

When al the ermanent connections of the system have can made, the casings 4 and the potential transformer casing 41 are filled with oil and the potential transformer fuses are preferably immersed in the oil in the casing ll. The boxes 1G and 21, the chamber 29 and the bus-bar casings 24 and.25 are preferably run in solid: with insula' com ound.

It will an erstood that the-switch gear may be modified in -various constructional way without dgparting from the scope of the invention. orexam le,-,the husehars, the boxes 16 and 21,'the o switch-8 and-tho potential transformer 41 may be arr ed in other positions relativel to the casing 4 and to one another. instead of the isolating and selector switches and the transformer devices being arranged'in one casing 4, the transformer devices ma be contained in a separate casing'in whic ar mngement, whilst the casing-containing the switches is filled with oil, the: casing contuinin the transformer devicesmay if desired be filled with insulating'compound instead of oil. In certain cases the trans.- former devices may be absent. When= the us-bars are not provided in duplicate, certain of the so-callcd selector switches; are omitted. and those remaining-:wouldbe more properly. termed isolating-switches. Althou h the invention has-beenreferred to as relating to iron-clad switch ear and: the various casings are usually made ofi iron, it will be understood that other metal, for instance, a non-magnetic metal, might be used when dealing with heavy currents. It will also be understood that the invention is in no way restricted to three-phase sys tems.

We claim as our invention 1. Electrical switch gear for a polyphase system comprisin a separate switch for each phase, a single means for actuating the said switches, a circuit breaker and means interlockin the said actuating means with the circuit renker, whereby opening movement of the said switches is precluded so long as the circuit breaker is in closed posi tion.

2. Electrical switch gear for a polyiphase system comprising a se arate switc for each phase, a separate ousin for each switch, a single means for actuating the said switches, a circuit breaker and means for interlocking the said actuating means with the circuit breaker, whereby movement of the said switches is precluded so long as the circuit breaker is in closed osition.

3. Electrical switch gear or a pol base system comprising a separate switc for each phase, a separate housing for each switch having terminals projecting therefrom, and a single distributing box joining the said housings and enclosing the said terminals and containing conductors leading to and from the said terminals.

4. Electrical switch gear for a polyphnse system comprising a separate switch for each phase, a separate honsin for each switch, and a single (llStTlhHtil'Ig lJOX having eachphase, Va separate openin' s therein adapted to be closed by the saii housings when the box and housings are in assembled operative relation-.-

- 5. The combination with a switch gear having an iso'la. switchand n plurality of relatively more le selector switches" for controlling 5|; plurality of pircuitsyzof-zt means for simultaneously? actuating the 'isolatino switch and e -selected' selector switch.

6. The combination with a switch gear having an isolating switch, selector switches for controlling a urality of circuits and an operating means therefor of a selector device for selectively connecting a. selected switch tothe operating means whereby the isolat-' phase and bus bar-s extending through the seid'housings and connected to the said terminals.

91* Switch gear comprising a plurality of switches, e-sm 1e means for operating the switches and bemg'relatively movable therewith, and movable means carried-by the said means for rendering'the' latter operative or inoperative with respect to the-said switches.

10. Switch gear comprising a. plurality of switches having I operating stemsfa relatively? movable bar :for operating =-the switches having openings through which the stems" reject,--and-"means'-carried by the bar -selectivly-engnging the stems for selectively render ng the ha r eifective for moving a selected switch.

In testimony whe'reof we I1'W e' hereunto subscribed'our' names this 22nd diary of Deminh'nr; 1 9911' WILLIAM ANSELM COATES; GEORGE SE1)WARD GITTI'NS'.

DAVID REGINALD DAVIES. 

